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Starting with 10.10.4, you can now enable Trim for 3rd party disks without resorting to 3rd party tools. Apple have included a new command line utility called trimforce.

Beware, the name was not picked acccidentally. Trimforce forces TRIM activation on all 3rd party SSDs regardless of whether they support it or not, so use at your own discretion. Generally, it should be safe to use if your disk manufacturer recommends having TRIM turned on, but only your own testing will confirm that. As always, be sure you have full and regular backups of your disks in case of data corruption.